[kot-l-uh-sawr] /ˈkɒt l əˌsɔr/ noun 1. any member of the extinct order Cotylosauria, comprising heavy-bodied, splay-limbed, plant-eating reptiles that arose during the Carboniferous Period and that are considered to include the ancestors of all other reptiles. cotylosaur (kŏt’l-ə-sôr’) Any of a number of extinct reptiles of the group Cotylosauria or Captorhinida of the Carboniferous and […]

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